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RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
Co-activators and Co-repressors02:04

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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
Eukaryotic Transcription Activators02:42

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Transcription activators are proteins that promote the transcription of genes from DNA to RNA. In most cases, these proteins contain two separate domains ‒ a domain that binds to DNA and a domain for activating transcription; however, in some cases, a single domain is responsible for both binding and activation of transcription, as seen in the glucocorticoid receptor and MyoD.
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Eukaryotic Transcription Inhibitors01:52

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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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RNA Polymerase II Accessory Proteins02:36

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Video Experimental Relacionado

Updated: Jun 27, 2026

Rapid Synthesis and Screening of Chemically Activated Transcription Factors with GFP-based Reporters
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Published on: November 27, 2013

Las proteínas transactivadoras VP16 y GAL4 se unen al factor de replicación A.

Z He1, B T Brinton, J Greenblatt

  • 1Department of Molecular and Medical Genetics, University of Toronto, Canada.

Cell
|June 18, 1993
PubMed
Resumen

Los factores de transcripción como VP16, GAL4 y p53 se unen directamente al factor de replicación A (RPA), una proteína clave en el inicio de la replicación del ADN. Esta interacción es crucial para activar la replicación del ADN y puede implicar la estabilización del ADN o el reclutamiento de la polimerasa alfa.

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Área de la Ciencia:

  • Biología Molecular Biología Molecular
  • Genética La genética.
  • La bioquímica es la bioquímica.

Sus antecedentes:

  • Los factores de transcripción juegan un papel en el inicio de la replicación del ADN.
  • El Factor de Replicación A (RPA) es esencial para la replicación del ADN.
  • Anteriormente, la interacción entre los factores de transcripción y el RPA no estaba clara.

Objetivo del estudio:

  • Investigar la interacción directa entre los factores de transcripción y el RPA.
  • Para identificar los sitios de unión específicos y las subunidades involucradas.
  • Comprender las implicaciones funcionales de esta interacción en la replicación del ADN.

Principales métodos:

  • La cromatografía de afinidad se utilizó para purificar e identificar a las parejas de unión.
  • Se probaron factores específicos de transcripción (VP16, GAL4, p53) y sus dominios de activación ácida.
  • Se realizó un análisis mutacional de VP16 para evaluar las consecuencias vinculantes y funcionales.

Principales resultados:

  • Los dominios de activación ácida de VP16, GAL4 y p53 se unen selectivamente al RPA humano y de levadura.
  • Esta unión es directa y ocurre con la subunidad más grande, RPA-1.
  • Las mutaciones que afectan la capacidad de VP16 para activar la replicación del ADN también afectaron su unión a RPA.

Conclusiones:

  • Los factores de transcripción interactúan directamente con RPA-1, una subunidad de RPA.
  • Esta interacción probablemente contribuye a estabilizar el ADN monocatenario en los orígenes de la replicación.
  • Los factores de transcripción pueden reclutar a la ADN polimerasa alfa para el complejo de iniciación de la replicación a través de RPA.